Delete row sig_e611078cce20 from signals

id sig_e611078cce20
event_id evt_a38cc3c01435
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_81294eda4 ...
dedupe_key signal_enriched:news_delta:c6471fc6383984bd
throttle_s 0
created_at 2026-04-17T22:47:58.928034+00:00
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